* Athens: move storage.NotFound to errors.NotFound
* see where things went wrong
* empty means unexpected
* GCP: replace AlreadyExists err
* resolve conflicts
* Errors: change not found name
* fix build
* download: add list from go cli
* download: include goget tests + hacky hack
* download: move dummyMod to pkg/module
* Olympus: pass dp and lggr to /list
* download: add Version to interface
* download: document Protocol